Countdown to Love: Starting from Reunion

Before you came, flowers were flowers and grass was grass. After you leave, the flowers, plants, trees, and everything else in the world will be yours. Jiang Yu thought he would never see that girl again in his life, but when he turned around accidentally, he saw that person in a dimly lit place. But the ending of this reunion was already written at the beginning. Is one year enough for her and him to leave a lifetime of memories?